<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="renderer" content="webkit">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=0">
</head>
<body>
    <script >
       // 判断数组中是否有这个元素
       const mingzhu = ['xiyou','honlou','sangyuoyanyi'];

       // 有则返回true 否则则false
        console.log(mingzhu.includes('xiyou'));

        // 幂运算，es7 中 将 Math.pow 替代为了 **
        console.log(Math.pow(2,10));
        console.log(2**10);

    </script>
</body>

</html>